Bolder joined David Bowie's backing band in 1971, alongside guitarist Mick Ronson � with whom he'd played in The Rats � and drummer Woody Woodmansey. He appeared on the albums Hunky Dory, The Rise And Fall Of Ziggy Stardust And The Spiders From Mars, Aladdin Sane and Pin Ups.

He replaced John Wetton in Heep in 1976 and made his recording debut with them on 1977′s Firefly. He also played on Innocent Victim, Fallen Angel and Conquest, before joining Wishbone Ash. In 1983 he returned to Mick Box's outfit and played on Equator two years later. He'd appeared on every album since, including their most recent outing, 2011′s Into The Wild.